Sharp estimates for a class of hyperbolic pseudo-differential equations
|
|
- Ami Miller
- 5 years ago
- Views:
Transcription
1 Results in Math., 41 (2002), Sharp estimates for a class of hyperbolic pseudo-differential equations Michael Ruzhansky Abstract In this paper we consider the Cauchy problem for a class of hyperbolic pseudo-differential operators. The considered class contains constant coefficient differential equations, also allowing the coefficients to depend on time. We establish sharp L p L q, Lipschitz, and other estimates for their solutions. In particular, the ellipticity condition for the roots of the principal symbol is eliminated for certain dimensions. We discuss the situation with no loss of smoothness for solutions. In the space R 1+n with n 4 (total dimension 5), we give a complete list of L p L q properties. In particular, this contains the very important case R Introduction The solutions of the Cauchy problem for the hyperbolic partial differential and pseudo-differential operators have been under study for a very long time. We will consider the situation when the j-th Cauchy data is in the Sobolev spaces L p m j, and we will study the question for which m j the fixed time solutions of the Cauchy problem belong to L p. Using standard methods one gets estimates for solutions in more general Sobolev spaces L p α, as well as Lipschitz and other function spaces. For p = 2, L 2 estimates correspond to the conservation of energy law and are relatively easy to obtain. However, for p 2, the problem becomes more subtle even for the wave equation. Some earlier estimates for the wave equation with variable coefficients in L p spaces can be found in [1], [5], [6], [7], [18], [20]. The case of compact Riemannian manifold is treated in [2]. The general approach to the L p estimates for solutions of hyperbolic Cauchy problems is to write them as a sum of time dependent Fourier integral operators applied to Cauchy data. This method is described in [3], [4] for differential operators, and in [24] for operators differential in time, but pseudo-differential in the space variables. In this way the estimates reduce to the corresponding L p estimates for time dependent Fourier integral operators. General regularity properties of Fourier 0 Mathematics Subject Classification (1991): 35A20, 35S30, 58G15, 32D20. 1
2 integral operators in L p and other function spaces can be found in [17], [19], [8], [13]. General L p properties were established in [16] and applied to solutions of strictly hyperbolic Cauchy problem. However, in a number of cases these results can be improved, see, for example, [9] and [13]. Regularity results for Fourier integral operators with complex phases and estimates for solutions of non-hyperbolic problems will appear in [14]. In this paper we will consider a class of constant coefficient operators, however allowing the dependence on time. In particular, our class includes constant coefficient differential or pseudo-differential operators. The L p L p estimates for hyperbolic operators with constant coefficients were treated in [21], [22] for convex and nonconvex characteristics, respectively. There the estimates for n = 2, 1 p 2, and n 3, p = 1, 2, were obtained. Several problems for constant coefficient operators in a 3 dimensional case were considered in [23]. In this paper we will allow operators to be differential in time, but pseudodifferential in space. In order to simplify the notation we single out one of the variables and call it time t. In particular, in R 1+n, this allows us to use the L p estimates for the Fourier integral operators in R n. Let X be a compact n dimensional manifold and let P (t, t, x ) = m t + m P j (t, x ) m j t (1) be a strictly hyperbolic differential pseudo-differential operator of order m, with t R and x X. We assume that the coefficients P j are classical symbols of order j depending smoothly on t. We also assume that P j are translation invariant in the sense that they do not depend on the x variable. The Cauchy problem for P is the equation { P u(t, x) = 0, t 0, j (2) t u t=0 = f j (x), 0 j m 1. As usual, D t = i t and D xj = i xj. Let σ P (t, τ, ξ) be the principal symbol of P in (2), that is the top order part of the symbol of P (t, D t, D x ), homogeneous of degree m. When operator P is strictly hyperbolic, problem (2) is well posed and its solution operator is given by a sum of elliptic Fourier integral operators ([24]). The strict hyperbolicity means that the principal symbol σ P (t, τ, ξ) has m real distinct roots in τ, τ j (t, ξ), which are real, homogeneous of degree one in ξ and smooth in t. Note that P (t, τ, ξ) is a polynomial in τ. It follows that the principal symbol σ P of P can be decomposed in the product m σ P (t, τ, ξ) = (τ τ j (t, ξ)). In this paper we will assume that σ P is real analytic in ξ, which is, for example, the case for differential operators P. The result of [16] states that if f j L p α+(n 1) 1/p 1/2 j (X), 0 j m 1, it follows that the solution u(t, ) L p α(x). Moreover, these orders are sharp when for 2
3 every t in the complement of a discrete set in R, at least one of the roots τ j is elliptic in ξ. However, in many cases this condition is not satisfied. It turns out that L p properties of solutions depend on the maximal rank k of ξξ 2 τ j(t, ξ), for j = 1,..., m. As usual, it is difficult to construct explicit examples of strictly hyperbolic equations with specific properties. However, one can readily see that there are many microlocal examples. Let us mention one specific example which still presents an open problem. Let the principal symbol σ P (τ, ξ) of the constant coefficients operator P in R R 5 be given by ( ) ( ) τ ξ1 ξ2ξ (ξ 3 ξ 5 ξ 2 ξ 4 ) 2 ξ5 3 τ + ξ1 ξ2ξ (ξ 3 ξ 5 ξ 2 ξ 4 ) 2 ξ5 3, microlocally in a small conic neighborhood C of ξ = (1, 1, 1, 1, 1). In this paper we will present sharp L p estimates for operators in R R n with n 4. However, in this example n = 5, and it is an open question whether in this case the loss of regularity in L p spaces is α p = 3 1/p 1/2 (since in this case k = 3), if we consider the Cauchy data f j with their wave fronts contained in C. This corresponds to a similar question for Fourier integral operators ([15]). We will give the sharp estimates for the class (1) in L p and Lipschitz spaces. By complex interpolation we also get sharp L q estimates for the solution when f j are in Sobolev L p spaces with q p. In the most important case of R 1+3 and in R 1+n, n 4, a complete list of sharp estimates is provided by Theorem 2.1. Dependent of the roots τ j, there is a certain loss of smoothness, regulated by α p of Theorem 2.2. We use the analysis of [13] and [9] to deduce the regularity results without any ellipticity assumption on τ j. This is based on the study of the factorization condition for Fourier integral operators ([13], [9]). We will make a technical assumption that X is real analytic, which is not restrictive since we are mainly interested in subsets of R n. A peculiar situation occurs when there is no loss of smoothness in the problem, that is when the problem resembles an elliptic problem with the solution given by a pseudo-differential operator. Technically this means that, f j L p m j, 0 j m 1, imply u(t, ) L p m. This is for example the case when p = 2. If p 2, this is still possible, but the operator P must assume a rather special form. This is discussed in Theorem 2.4. For our argument we use the representation formula established in Lemma 3.1. For an underlying relation to the Fourier integral operators and their singularities we refer to [13] for the case of differential equations and to [14] for the case of a non-hyperbolic class of equations. In a way, the present paper can be regarded as a supplement to [9], [10], providing proofs and extending results announced in [10]. Let us also note that due to editorial reasons the general perspective for results of this paper can be found in [13] and in [14]. The present paper is based on the preprint [12]. I would like to express my gratitude to professor Duistermaat for the discussions on Fourier integral operators and to professor Sogge for the discussions we had during my one year visit to the Johns Hopkins University. I am also grateful to the referee for a number of valuable remarks. 3
4 2 Main Results Let P, σ P (t, τ, ξ) and τ j be as in the introduction. The solution of problem (2) for small t can be obtained in the following way. Let Φ j (t, x, ξ) be the solution of the following eikonal equation: { Φ t j(t, x, ξ) = τ j (t, x Φ j ), (3) Φ j (t, x, ξ) t=0 = x, ξ. Then the solution u(t, x) can be written as a smooth function plus a finite sum of t-dependent elliptic Fourier integral operators u(t, x) = m l=0 R n R n e 2πi(Φ j(t,x,ξ) y,ξ ) a jl (t, x, ξ)f l (y)dξdy, (4) with canonical relations locally defined by the solutions Φ j of (3) and symbols a jl S l, satisfying the transport equations, see [24]. The expression (4) is smooth in t. For a fixed t, the canonical relation of the solution operator in (4), is equal to C t = m {(x, ξ, y, η) : χ t,j (y, η) = (x, ξ)}, where the canonical transformation χ t,j : T X\0 T X\0 is defined by a flow along the time dependent Hamilton vector field H j = n ( τj τ ) j = ξ j x j x j ξ j in T X\0, from (y, η) at t = 0 to (x, ξ) at t. Treating t as a variable, the canonical relation for the solution operator (4) becomes C = n τ j ξ j x j m {(x, ξ, y, η, t, τ) : τ = τ j (t, ξ), χ t,j (y, η) = (x, ξ)}. Using this representation and asymptotic expansion of D 2 ξξ Φ j with respect to t, it was shown in [16] that under an additional assumption that for each t one of the roots τ j is elliptic, for t outside a discrete set in R, holds rank D 2 ξξ Φ j = n 1. This is for example the case for the wave type equation. For other values of the rank, we have the following Theorem 2.1 Let u(t, x) be the solution of the Cauchy problem (2) and let Φ j (t, x, ξ) solve the eikonal equations (3). Let k = max x,ξ,j rank 2 ξ 2 Φ j(t, x, ξ) (5) 4
5 and assume that k 2. We also write α p = k 1/p 1/2 for 1 < p <. Then if f j L p α+α p j (X), it follows that u(t, ) Lp α(x). Moreover, if k = max x,ξ,j,t [ T,T ] with fixed 0 < T < and k 2, then u(t, ) L p α C T and these orders can not be improved. j=0 rank 2 ξ 2 Φ j(t, x, ξ) f j L p, t [ T, T ], (6) α+αp j In the case of R 1+n with n 4, we do not need any assumptions on k. Theorem 2.2 Let n 4 and let u(t, x) be the solution of the Cauchy problem (2). Let k be defined by (5), not necessarily k 2. Then the conclusions of Theorem 2.1 hold and the orders are sharp. In other function spaces we have Theorem 2.3 In the conditions of Theorems 2.1 and 2.2 the following estimates hold. (i) Let 1 < p q 2. Then u(t, ) L q α C T j=0 f j L p, t [ T, T ], (7) α+αpq j where α pq = n/p+(n k)/q+k/2. The dual result holds for 2 p q <. (ii) For Lipschitz spaces Lip(γ) we have u(t, ) Lip (α) C T j=0 None of the orders above can be improved. f j Lip (α+k/2 j), t [ T, T ]. (8) The best L p properties are exhibited by the operators in (4) for which α p in Theorems 2.1 and 2.2 is zero and there is no loss of smoothness for the solutions. For such operators we can expect k = 0 and according to the representation formula for elliptic operators in [11], they assume the form of a pseudo differential operator composed with a pullback by a smooth coordinate change. However, this turns out to be possible for n = 1 only. 5
6 Theorem 2.4 Let 1 < p <, p 2. Then for every Cauchy data f j L p m j, the solution u(t, ) of (2) belongs to L p m (for small t), if and only if n = 1 and characteristic roots τ j (t, ξ) are linear in ξ. Moreover, in both cases there exist pseudodifferential operators Q jl, S jl Ψ l (Y ) and smooth mappings κ j : X Y such that the solution to (2) is given by u = l=0 m (κ j Q jl )f l = l=0 m (S jl κ j)f l, (9) where κ j are the pullbacks by κ j defined by κ j(f)(x) = f(κ(x)). The Sobolev space estimates (6) hold with α p = 0. Note, that for p = 2 the assumption of this theorem always holds. Remark 2.5 If X is not compact, a local version of Theorems hold for the compactly supported Cauchy data. The solution u(t, ) belongs to the localizations of the corresponding spaces in Theorems Proofs Proof of Theorem 2.1: Let for a fixed ξ the function H j (t, ξ) be the solution of the ordinary differential equation H j t (t, ξ) = τ j(t, ξ), H j (0, ξ) = 0. (10) The symbol σ P is a polynomial in τ, which implies that the roots τ j (t, ξ) are analytic in ξ for ξ 0, and smooth in t in view of the strict hyperbolicity of P. The functions Φ j (t, x, ξ) = x, ξ H j (t, ξ) then satisfy the eikonal equations (3). Because τ j is homogeneous of degree one in ξ, we get that for t sufficiently small, functions H j (t, ξ) are analytic for ξ 0, and homogeneous of degree one in ξ and smooth in t. It follows that the localized Fourier integral operators in (4) are translation invariant and their phase functions are analytic, since we can always cut off the symbol in a neighborhood of ξ = 0 without changing L p estimates, to make the phase function analytic in the support of the symbol. The estimates of Theorem 2.1 now follow from Theorem 7 in [9]. The sharpness follows from the stationary phase argument in Proposition 1 of [11] and the ellipticity of the operators in (4). Proof of Theorem 2.2: This is a direct consequence of Theorem 2.1, where we use Theorem 8 in [9] for the case n = 4, k = 3. Proof of Theorem 2.3: The first part follows from L p estimates of Theorems 2.1 and 2.2 and H 1 L 2 estimates for Fourier integral operators of order n/2 ([19, Ch.3,5.21]). The sharpness argument for any k is as in [11]. The second part is 6
7 the duality argument as in [16], where we use the fact that the translation invariant analytic Fourier integral operators of order k/2 are bounded from H 1 to L 1, which in turn follows from the arguments in Section 5 in [16] and Theorem 2 and Theorem 6 in [9] if k = 1 and k = 2, respectively. Proof of Theorem 2.4: For the completeness of the argument we give the following result, which is Theorem 2 in [11]: Lemma 3.1 Let T I 0 (X, Y ; Λ) be an elliptic Fourier integral operator and assume Λ to be a local graph, 1 < p <, p 2. Then T is continuous from L p comp(y ) to L p loc (X) if and only if there exist P Ψ0 (X), Q Ψ 0 (Y ), such that T = P κ = κ + Q, where κ and κ + are the pullbacks by smooth coordinate changes X Y. We also note that since the canonical relations of κ + and κ viewed as Fourier integral operators, are equal to Λ, it follows that they are the same. Suppose that n 2 and τ j are linear in ξ. Differentiating equation (10) with respect to ξ twice, we get ξξ 2 th j (t, ξ) = 0. Therefore, ξξ 2 H j(t, ξ) = ξξ 2 H j(0, ξ) = 0 and H j is linear in ξ. The rank k in (5) is then equal to zero, which implies the statement because pseudo-differential operators of order j is continuous from (L p α) comp to (L p α+j ). loc Suppose now that P is such that for every Cauchy data f j L p m j, the solution u(t, ) of (2) belongs to L p m. Let T l be an operator of order l in (4). Applying Lemma 3.1 to T = T l (I Δ) l/2 implies formula (9). It also implies that k = 0 and, therefore, ξξ 2 τ j(t, ξ) = t ξξ 2 H j(t, ξ) = 0. It follows that τ j must be a polynomial of degree 1 in ξ. In fact, it is linear in ξ since it also homogeneous of degree one. Now, since P is strictly hyperbolic, all τ j must be different, which is possible only if n = 1. The last statement of Theorem 2.4 on the Sobolev estimates follows from the fact that a pseudo-differential operator of order j is continuous from (L p α) comp to (L p α+j ). loc References [1] M. Beals, L p boundedness of Fourier integrals, Mem. Amer. Math. Soc., 264 (1982). [2] Y. Colin de Verdière, M. Frisch, Régularité Lipschitzienne et solutions de l équation des ondes sur une viriété Riemannienne compacte, Ann. Scient. Ecole Norm. Sup., 9 (1976), [3] J.J. Duistermaat, Fourier integral operators, Birkhäuser, Boston, [4] L. Hörmander, The analysis of linear partial differential operators. Vols. III IV, Springer-Verlag, New York, Berlin, [5] W. Littman, L p L q -estimates for singular integral operators, Proc. Symp. Pure and Appl. Math. A.M.S., 23 (1973) [6] A. Miyachi, On some estimates for the wave operator in L p and H p, J. Fac. Sci. Univ. Tokyo Sect. IA Math., 27 (1980),
8 [7] J. Peral, L p estimates for the wave equation, J. Funct. Anal., 36 (1980), [8] D.H. Phong, Regularity of Fourier integral operators, Proc. Int. Congress Math., (1994), Zürich, Switzerland. [9] M. Ruzhansky, Analytic Fourier integral operators, Monge-Ampère equation and holomorphic factorization, Arch. Mat., 72, (1999). [10] M. Ruzhansky, Holomorphic factorization for the solution operators for hyperbolic equations, Int. Series of Num. Math. 130, (1999). [11] M. Ruzhansky, On the sharpness of Seeger-Sogge-Stein orders, Hokkaido Math. J. 28, (1999). [12] M. Ruzhansky, Sharp estimates for a class of hyperbolic differential equations, preprint, [13] M.V. Ruzhansky, Singularities of affine fibrations in the regularity theory of Fourier integral operators, Russian Math. Surveys 55, (2000). [14] M. Ruzhansky, Regularity theory of Fourier integral operators with complex phases and singularities of affine fibrations, CWI Tracts, to appear. [15] M. Ruzhansky, On the failure of the factorization condition for non-degenerate Fourier integral operators, to appear in Proc. Amer. Math. Soc. [16] A. Seeger, C.D. Sogge and E.M. Stein, Regularity properties of Fourier integral operators, Ann.of Math., 134 (1991), [17] C.D. Sogge, Fourier integrals in classical analysis, Cambridge University Press, [18] E. M. Stein, L p boundedness of certain convolution operators, Bull. Amer. Math. Soc., 77 (1971), [19] E.M. Stein, Harmonic analysis, Princeton University Press, Princeton, [20] M. Sugimoto, On some L p -estimates for hyperbolic equations, Arkiv för Matematik, 30 (1992), [21] M. Sugimoto, A priori estimates for higher order hyperbolic equations, Math. Z., 215 (1994), [22] M. Sugimoto, Estimates for hyperbolic equations with non-convex characteristics, Math. Z., 222 (1996), [23] M. Sugimoto, Estimates for hyperbolic equations of space dimension 3, J. Funct. Anal., 160 (1998), [24] F. Treves, Introduction to pseudodifferential and Fourier integral operators, Vol. 2, Plenum Press, Department of Mathematics, Johns Hopkins University, Baltimore, MD New address: Mathematics Department, Imperial College, London, UK address: ruzh@ic.ac.uk Eingegangen am Juli
Singularities of affine fibrations in the regularity theory of Fourier integral operators
Russian Math. Surveys, 55 (2000), 93-161. Singularities of affine fibrations in the regularity theory of Fourier integral operators Michael Ruzhansky In the paper the regularity properties of Fourier integral
More informationBoundedness of Fourier integral operators on Fourier Lebesgue spaces and related topics
Boundedness of Fourier integral operators on Fourier Lebesgue spaces and related topics Fabio Nicola (joint work with Elena Cordero and Luigi Rodino) Dipartimento di Matematica Politecnico di Torino Applied
More informationMicrolocal Analysis : a short introduction
Microlocal Analysis : a short introduction Plamen Stefanov Purdue University Mini Course, Fields Institute, 2012 Plamen Stefanov (Purdue University ) Microlocal Analysis : a short introduction 1 / 25 Introduction
More informationResearch Statement. Xiangjin Xu. 1. My thesis work
Research Statement Xiangjin Xu My main research interest is twofold. First I am interested in Harmonic Analysis on manifolds. More precisely, in my thesis, I studied the L estimates and gradient estimates
More informationTitle: Localized self-adjointness of Schrödinger-type operators on Riemannian manifolds. Proposed running head: Schrödinger-type operators on
Title: Localized self-adjointness of Schrödinger-type operators on Riemannian manifolds. Proposed running head: Schrödinger-type operators on manifolds. Author: Ognjen Milatovic Department Address: Department
More informationRegularity theory of Fourier integral operators with complex phases and singularities of affine fibrations
Regularity theory of Fourier integral operators with complex phases and singularities of affine fibrations Michael Ruzhansky Monograph published: CWI Tract, 131. Stichting Mathematisch Centrum, Centrum
More informationCOMPARISON PRINCIPLES FOR CONSTRAINED SUBHARMONICS PH.D. COURSE - SPRING 2019 UNIVERSITÀ DI MILANO
COMPARISON PRINCIPLES FOR CONSTRAINED SUBHARMONICS PH.D. COURSE - SPRING 2019 UNIVERSITÀ DI MILANO KEVIN R. PAYNE 1. Introduction Constant coefficient differential inequalities and inclusions, constraint
More informationA Remark on the Regularity of Solutions of Maxwell s Equations on Lipschitz Domains
A Remark on the Regularity of Solutions of Maxwell s Equations on Lipschitz Domains Martin Costabel Abstract Let u be a vector field on a bounded Lipschitz domain in R 3, and let u together with its divergence
More informationarxiv: v1 [math.ap] 18 May 2017
Littlewood-Paley-Stein functions for Schrödinger operators arxiv:175.6794v1 [math.ap] 18 May 217 El Maati Ouhabaz Dedicated to the memory of Abdelghani Bellouquid (2/2/1966 8/31/215) Abstract We study
More informationChanging sign solutions for the CR-Yamabe equation
Changing sign solutions for the CR-Yamabe equation Ali Maalaoui (1) & Vittorio Martino (2) Abstract In this paper we prove that the CR-Yamabe equation on the Heisenberg group has infinitely many changing
More informationPOINTWISE BOUNDS ON QUASIMODES OF SEMICLASSICAL SCHRÖDINGER OPERATORS IN DIMENSION TWO
POINTWISE BOUNDS ON QUASIMODES OF SEMICLASSICAL SCHRÖDINGER OPERATORS IN DIMENSION TWO HART F. SMITH AND MACIEJ ZWORSKI Abstract. We prove optimal pointwise bounds on quasimodes of semiclassical Schrödinger
More information. A NOTE ON THE RESTRICTION THEOREM AND GEOMETRY OF HYPERSURFACES
. A NOTE ON THE RESTRICTION THEOREM AND GEOMETRY OF HYPERSURFACES FABIO NICOLA Abstract. A necessary condition is established for the optimal (L p, L 2 ) restriction theorem to hold on a hypersurface S,
More informationOn Strichartz estimates for hyperbolic equations with constant coefficients
RIMS Kôkyûroku Bessatsu B10 (2008), 177 189 On Strichartz estimates for hyperbolic equations with constant coefficients By Michael Ruzhansky Abstract In this note we will review how one can carry out comprehensive
More informationERRATUM TO AFFINE MANIFOLDS, SYZ GEOMETRY AND THE Y VERTEX
ERRATUM TO AFFINE MANIFOLDS, SYZ GEOMETRY AND THE Y VERTEX JOHN LOFTIN, SHING-TUNG YAU, AND ERIC ZASLOW 1. Main result The purpose of this erratum is to correct an error in the proof of the main result
More information(This is a sample cover image for this issue. The actual cover is not yet available at this time.)
(This is a sample cover image for this issue. The actual cover is not yet available at this time.) This article appeared in a journal published by Elsevier. The attached copy is furnished to the author
More informationMICROLOCAL ANALYSIS METHODS
MICROLOCAL ANALYSIS METHODS PLAMEN STEFANOV One of the fundamental ideas of classical analysis is a thorough study of functions near a point, i.e., locally. Microlocal analysis, loosely speaking, is analysis
More informationOn the Convergence of a Modified Kähler-Ricci Flow. 1 Introduction. Yuan Yuan
On the Convergence of a Modified Kähler-Ricci Flow Yuan Yuan Abstract We study the convergence of a modified Kähler-Ricci flow defined by Zhou Zhang. We show that the modified Kähler-Ricci flow converges
More informationUNIQUENESS OF TRACES ON LOG-POLYHOMOGENEOUS PDOS
Author manuscript, published in "Journal of the Australian Mathematical Society 90, 2 (2011) 171-181" DOI : 10.1017/S1446788711001194 UNIQUENESS OF TRACES ON LOG-POLYHOMOGENEOUS PDOS C. DUCOURTIOUX and
More informationSeong Joo Kang. Let u be a smooth enough solution to a quasilinear hyperbolic mixed problem:
Comm. Korean Math. Soc. 16 2001, No. 2, pp. 225 233 THE ENERGY INEQUALITY OF A QUASILINEAR HYPERBOLIC MIXED PROBLEM Seong Joo Kang Abstract. In this paper, e establish the energy inequalities for second
More informationOSCILLATORY SINGULAR INTEGRALS ON L p AND HARDY SPACES
POCEEDINGS OF THE AMEICAN MATHEMATICAL SOCIETY Volume 24, Number 9, September 996 OSCILLATOY SINGULA INTEGALS ON L p AND HADY SPACES YIBIAO PAN (Communicated by J. Marshall Ash) Abstract. We consider boundedness
More informationdoi: /j.jde
doi: 10.1016/j.jde.016.08.019 On Second Order Hyperbolic Equations with Coefficients Degenerating at Infinity and the Loss of Derivatives and Decays Tamotu Kinoshita Institute of Mathematics, University
More informationRegularity and compactness for the DiPerna Lions flow
Regularity and compactness for the DiPerna Lions flow Gianluca Crippa 1 and Camillo De Lellis 2 1 Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy. g.crippa@sns.it 2 Institut für Mathematik,
More informationarxiv: v3 [math.ap] 1 Sep 2017
arxiv:1603.0685v3 [math.ap] 1 Sep 017 UNIQUE CONTINUATION FOR THE SCHRÖDINGER EQUATION WITH GRADIENT TERM YOUNGWOO KOH AND IHYEOK SEO Abstract. We obtain a unique continuation result for the differential
More informationWEYL S LEMMA, ONE OF MANY. Daniel W. Stroock
WEYL S LEMMA, ONE OF MANY Daniel W Stroock Abstract This note is a brief, and somewhat biased, account of the evolution of what people working in PDE s call Weyl s Lemma about the regularity of solutions
More informationON BOUNDEDNESS OF MAXIMAL FUNCTIONS IN SOBOLEV SPACES
Annales Academiæ Scientiarum Fennicæ Mathematica Volumen 29, 2004, 167 176 ON BOUNDEDNESS OF MAXIMAL FUNCTIONS IN SOBOLEV SPACES Piotr Haj lasz and Jani Onninen Warsaw University, Institute of Mathematics
More informationTHE FORM SUM AND THE FRIEDRICHS EXTENSION OF SCHRÖDINGER-TYPE OPERATORS ON RIEMANNIAN MANIFOLDS
THE FORM SUM AND THE FRIEDRICHS EXTENSION OF SCHRÖDINGER-TYPE OPERATORS ON RIEMANNIAN MANIFOLDS OGNJEN MILATOVIC Abstract. We consider H V = M +V, where (M, g) is a Riemannian manifold (not necessarily
More informationOn Estimates of Biharmonic Functions on Lipschitz and Convex Domains
The Journal of Geometric Analysis Volume 16, Number 4, 2006 On Estimates of Biharmonic Functions on Lipschitz and Convex Domains By Zhongwei Shen ABSTRACT. Using Maz ya type integral identities with power
More informationnp n p n, where P (E) denotes the
Mathematical Research Letters 1, 263 268 (1994) AN ISOPERIMETRIC INEQUALITY AND THE GEOMETRIC SOBOLEV EMBEDDING FOR VECTOR FIELDS Luca Capogna, Donatella Danielli, and Nicola Garofalo 1. Introduction The
More informationHardy spaces associated to operators satisfying Davies-Gaffney estimates and bounded holomorphic functional calculus.
Hardy spaces associated to operators satisfying Davies-Gaffney estimates and bounded holomorphic functional calculus. Xuan Thinh Duong (Macquarie University, Australia) Joint work with Ji Li, Zhongshan
More informationBesov-type spaces with variable smoothness and integrability
Besov-type spaces with variable smoothness and integrability Douadi Drihem M sila University, Department of Mathematics, Laboratory of Functional Analysis and Geometry of Spaces December 2015 M sila, Algeria
More informationPart 2 Introduction to Microlocal Analysis
Part 2 Introduction to Microlocal Analysis Birsen Yazıcı & Venky Krishnan Rensselaer Polytechnic Institute Electrical, Computer and Systems Engineering August 2 nd, 2010 Outline PART II Pseudodifferential
More informationCUTOFF RESOLVENT ESTIMATES AND THE SEMILINEAR SCHRÖDINGER EQUATION
CUTOFF RESOLVENT ESTIMATES AND THE SEMILINEAR SCHRÖDINGER EQUATION HANS CHRISTIANSON Abstract. This paper shows how abstract resolvent estimates imply local smoothing for solutions to the Schrödinger equation.
More informationSOME ASPECTS ON CIRCLES AND HELICES IN A COMPLEX PROJECTIVE SPACE. Toshiaki Adachi* and Sadahiro Maeda
Mem. Fac. Sci. Eng. Shimane Univ. Series B: Mathematical Science 32 (1999), pp. 1 8 SOME ASPECTS ON CIRCLES AND HELICES IN A COMPLEX PROJECTIVE SPACE Toshiaki Adachi* and Sadahiro Maeda (Received December
More informationChapter One. The Calderón-Zygmund Theory I: Ellipticity
Chapter One The Calderón-Zygmund Theory I: Ellipticity Our story begins with a classical situation: convolution with homogeneous, Calderón- Zygmund ( kernels on R n. Let S n 1 R n denote the unit sphere
More informationThe Cauchy problem for certain syst characteristics. Author(s) Parenti, Cesare; Parmeggiani, Alber. Citation Osaka Journal of Mathematics.
Title The Cauchy problem for certain syst characteristics Authors Parenti, Cesare; Parmeggiani, Alber Citation Osaka Journal of Mathematics. 413 Issue 4-9 Date Text Version publisher URL http://hdl.handle.net/1194/6939
More informationMAXIMAL AVERAGE ALONG VARIABLE LINES. 1. Introduction
MAXIMAL AVERAGE ALONG VARIABLE LINES JOONIL KIM Abstract. We prove the L p boundedness of the maximal operator associated with a family of lines l x = {(x, x 2) t(, a(x )) : t [0, )} when a is a positive
More informationON A MAXIMAL OPERATOR IN REARRANGEMENT INVARIANT BANACH FUNCTION SPACES ON METRIC SPACES
Vasile Alecsandri University of Bacău Faculty of Sciences Scientific Studies and Research Series Mathematics and Informatics Vol. 27207), No., 49-60 ON A MAXIMAL OPRATOR IN RARRANGMNT INVARIANT BANACH
More informationEXISTENCE AND REGULARITY RESULTS FOR SOME NONLINEAR PARABOLIC EQUATIONS
EXISTECE AD REGULARITY RESULTS FOR SOME OLIEAR PARABOLIC EUATIOS Lucio BOCCARDO 1 Andrea DALL AGLIO 2 Thierry GALLOUËT3 Luigi ORSIA 1 Abstract We prove summability results for the solutions of nonlinear
More informationA REMARK ON AN EQUATION OF WAVE MAPS TYPE WITH VARIABLE COEFFICIENTS
A REMARK ON AN EQUATION OF WAVE MAPS TYPE WITH VARIABLE COEFFICIENTS DAN-ANDREI GEBA Abstract. We obtain a sharp local well-posedness result for an equation of wave maps type with variable coefficients.
More informationOn m-accretive Schrödinger operators in L p -spaces on manifolds of bounded geometry
On m-accretive Schrödinger operators in L p -spaces on manifolds of bounded geometry Ognjen Milatovic Department of Mathematics and Statistics University of North Florida Jacksonville, FL 32224 USA. Abstract
More informationNON-ANALYTIC HYPOELLIPTICITY IN THE PRESENCE OF SYMPLECTICITY
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY Volume 126, Number 2, February 1998, Pages 45 49 S 2-9939(98)4115-X NON-ANALYTIC HYPOELLIPTICITY IN THE PRESENCE OF SYMPLECTICITY NICHOLAS HANGES AND A.
More informationRecent developments in elliptic partial differential equations of Monge Ampère type
Recent developments in elliptic partial differential equations of Monge Ampère type Neil S. Trudinger Abstract. In conjunction with applications to optimal transportation and conformal geometry, there
More informationExtension and Representation of Divergence-free Vector Fields on Bounded Domains. Tosio Kato, Marius Mitrea, Gustavo Ponce, and Michael Taylor
Extension and Representation of Divergence-free Vector Fields on Bounded Domains Tosio Kato, Marius Mitrea, Gustavo Ponce, and Michael Taylor 1. Introduction Let Ω R n be a bounded, connected domain, with
More informationLECTURE 3 Functional spaces on manifolds
LECTURE 3 Functional spaces on manifolds The aim of this section is to introduce Sobolev spaces on manifolds (or on vector bundles over manifolds). These will be the Banach spaces of sections we were after
More informationSELF-ADJOINTNESS OF SCHRÖDINGER-TYPE OPERATORS WITH SINGULAR POTENTIALS ON MANIFOLDS OF BOUNDED GEOMETRY
Electronic Journal of Differential Equations, Vol. 2003(2003), No.??, pp. 1 8. ISSN: 1072-6691. URL: http://ejde.math.swt.edu or http://ejde.math.unt.edu ftp ejde.math.swt.edu (login: ftp) SELF-ADJOINTNESS
More informationPERIODIC HYPERFUNCTIONS AND FOURIER SERIES
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY Volume 128, Number 8, Pages 2421 2430 S 0002-9939(99)05281-8 Article electronically published on December 7, 1999 PERIODIC HYPERFUNCTIONS AND FOURIER SERIES
More informationWavelets and modular inequalities in variable L p spaces
Wavelets and modular inequalities in variable L p spaces Mitsuo Izuki July 14, 2007 Abstract The aim of this paper is to characterize variable L p spaces L p( ) (R n ) using wavelets with proper smoothness
More informationSharp Gårding inequality on compact Lie groups.
15-19.10.2012, ESI, Wien, Phase space methods for pseudo-differential operators Ville Turunen, Aalto University, Finland (ville.turunen@aalto.fi) M. Ruzhansky, V. Turunen: Sharp Gårding inequality on compact
More informationPARTIAL REGULARITY OF BRENIER SOLUTIONS OF THE MONGE-AMPÈRE EQUATION
PARTIAL REGULARITY OF BRENIER SOLUTIONS OF THE MONGE-AMPÈRE EQUATION ALESSIO FIGALLI AND YOUNG-HEON KIM Abstract. Given Ω, Λ R n two bounded open sets, and f and g two probability densities concentrated
More informationBloch radius, normal families and quasiregular mappings
Bloch radius, normal families and quasiregular mappings Alexandre Eremenko Abstract Bloch s Theorem is extended to K-quasiregular maps R n S n, where S n is the standard n-dimensional sphere. An example
More informationFORMAL GROUPS OF CERTAIN Q-CURVES OVER QUADRATIC FIELDS
Sairaiji, F. Osaka J. Math. 39 (00), 3 43 FORMAL GROUPS OF CERTAIN Q-CURVES OVER QUADRATIC FIELDS FUMIO SAIRAIJI (Received March 4, 000) 1. Introduction Let be an elliptic curve over Q. We denote by ˆ
More informationA CHARACTERIZATION OF STRICT LOCAL MINIMIZERS OF ORDER ONE FOR STATIC MINMAX PROBLEMS IN THE PARAMETRIC CONSTRAINT CASE
Journal of Applied Analysis Vol. 6, No. 1 (2000), pp. 139 148 A CHARACTERIZATION OF STRICT LOCAL MINIMIZERS OF ORDER ONE FOR STATIC MINMAX PROBLEMS IN THE PARAMETRIC CONSTRAINT CASE A. W. A. TAHA Received
More informationRegularity and nonexistence results for anisotropic quasilinear elliptic equations in convex domains
Regularity and nonexistence results for anisotropic quasilinear elliptic equations in convex domains Ilaria FRAGALÀ Filippo GAZZOLA Dipartimento di Matematica del Politecnico - Piazza L. da Vinci - 20133
More informationDiscrete Operators in Canonical Domains
Discrete Operators in Canonical Domains VLADIMIR VASILYEV Belgoro National Research University Chair of Differential Equations Stuencheskaya 14/1, 308007 Belgoro RUSSIA vlaimir.b.vasilyev@gmail.com Abstract:
More informationPart 2 Introduction to Microlocal Analysis
Part 2 Introduction to Microlocal Analysis Birsen Yazıcı& Venky Krishnan Rensselaer Polytechnic Institute Electrical, Computer and Systems Engineering March 15 th, 2010 Outline PART II Pseudodifferential(ψDOs)
More informationNECESSARY CONDITIONS FOR WEIGHTED POINTWISE HARDY INEQUALITIES
NECESSARY CONDITIONS FOR WEIGHTED POINTWISE HARDY INEQUALITIES JUHA LEHRBÄCK Abstract. We establish necessary conditions for domains Ω R n which admit the pointwise (p, β)-hardy inequality u(x) Cd Ω(x)
More informationPiecewise Smooth Solutions to the Burgers-Hilbert Equation
Piecewise Smooth Solutions to the Burgers-Hilbert Equation Alberto Bressan and Tianyou Zhang Department of Mathematics, Penn State University, University Park, Pa 68, USA e-mails: bressan@mathpsuedu, zhang
More informationON THE DEFORMATION WITH CONSTANT MILNOR NUMBER AND NEWTON POLYHEDRON
ON THE DEFORMATION WITH CONSTANT MILNOR NUMBER AND NEWTON POLYHEDRON OULD M ABDERRAHMANE Abstract- We show that every µ-constant family of isolated hypersurface singularities satisfying a nondegeneracy
More informationABSOLUTE CONTINUITY OF FOLIATIONS
ABSOLUTE CONTINUITY OF FOLIATIONS C. PUGH, M. VIANA, A. WILKINSON 1. Introduction In what follows, U is an open neighborhood in a compact Riemannian manifold M, and F is a local foliation of U. By this
More informationCitation Osaka Journal of Mathematics. 41(4)
TitleA non quasi-invariance of the Brown Authors Sadasue, Gaku Citation Osaka Journal of Mathematics. 414 Issue 4-1 Date Text Version publisher URL http://hdl.handle.net/1194/1174 DOI Rights Osaka University
More informationESTIMATES FOR ELLIPTIC HOMOGENIZATION PROBLEMS IN NONSMOOTH DOMAINS. Zhongwei Shen
W,p ESTIMATES FOR ELLIPTIC HOMOGENIZATION PROBLEMS IN NONSMOOTH DOMAINS Zhongwei Shen Abstract. Let L = div`a` x, > be a family of second order elliptic operators with real, symmetric coefficients on a
More informationNote on the Chen-Lin Result with the Li-Zhang Method
J. Math. Sci. Univ. Tokyo 18 (2011), 429 439. Note on the Chen-Lin Result with the Li-Zhang Method By Samy Skander Bahoura Abstract. We give a new proof of the Chen-Lin result with the method of moving
More informationSmooth pointwise multipliers of modulation spaces
An. Şt. Univ. Ovidius Constanţa Vol. 20(1), 2012, 317 328 Smooth pointwise multipliers of modulation spaces Ghassem Narimani Abstract Let 1 < p,q < and s,r R. It is proved that any function in the amalgam
More informationarxiv: v1 [math.cv] 15 Nov 2018
arxiv:1811.06438v1 [math.cv] 15 Nov 2018 AN EXTENSION THEOREM OF HOLOMORPHIC FUNCTIONS ON HYPERCONVEX DOMAINS SEUNGJAE LEE AND YOSHIKAZU NAGATA Abstract. Let n 3 and be a bounded domain in C n with a smooth
More informationOn Dense Embeddings of Discrete Groups into Locally Compact Groups
QUALITATIVE THEORY OF DYNAMICAL SYSTEMS 4, 31 37 (2003) ARTICLE NO. 50 On Dense Embeddings of Discrete Groups into Locally Compact Groups Maxim S. Boyko Institute for Low Temperature Physics and Engineering,
More informationON SOME ELLIPTIC PROBLEMS IN UNBOUNDED DOMAINS
Chin. Ann. Math.??B(?), 200?, 1 20 DOI: 10.1007/s11401-007-0001-x ON SOME ELLIPTIC PROBLEMS IN UNBOUNDED DOMAINS Michel CHIPOT Abstract We present a method allowing to obtain existence of a solution for
More informationNew Proof of Hörmander multiplier Theorem on compact manifolds without boundary
New Proof of Hörmander multiplier Theorem on compact manifolds without boundary Xiangjin Xu Department of athematics Johns Hopkins University Baltimore, D, 21218, USA xxu@math.jhu.edu Abstract On compact
More informationWeighted Composition Operators on Sobolev - Lorentz Spaces
Int. J. Contemp. Math. Sciences, Vol. 6, 2011, no. 22, 1071-1078 Weighted Composition Operators on Sobolev - Lorentz Spaces S. C. Arora Department of Mathematics University of Delhi, Delhi - 110007, India
More informationDispersive Equations and Hyperbolic Orbits
Dispersive Equations and Hyperbolic Orbits H. Christianson Department of Mathematics University of California, Berkeley 4/16/07 The Johns Hopkins University Outline 1 Introduction 3 Applications 2 Main
More informationTHERMO AND PHOTOACOUSTIC TOMOGRAPHY WITH VARIABLE SPEED AND PLANAR DETECTORS
THERMO AND PHOTOACOUSTIC TOMOGRAPHY WITH VARIABLE SPEED AND PLANAR DETECTORS PLAMEN STEFANOV AND YANG YANG Abstract. We analyze the mathematical model of multiwave tomography with a variable speed with
More informationScalar curvature and the Thurston norm
Scalar curvature and the Thurston norm P. B. Kronheimer 1 andt.s.mrowka 2 Harvard University, CAMBRIDGE MA 02138 Massachusetts Institute of Technology, CAMBRIDGE MA 02139 1. Introduction Let Y be a closed,
More informationIntroduction to analysis on manifolds with corners
Introduction to analysis on manifolds with corners Daniel Grieser (Carl von Ossietzky Universität Oldenburg) June 19, 20 and 21, 2017 Summer School and Workshop The Sen conjecture and beyond, UCL Daniel
More informationSCALE INVARIANT FOURIER RESTRICTION TO A HYPERBOLIC SURFACE
SCALE INVARIANT FOURIER RESTRICTION TO A HYPERBOLIC SURFACE BETSY STOVALL Abstract. This result sharpens the bilinear to linear deduction of Lee and Vargas for extension estimates on the hyperbolic paraboloid
More informationA Walking Tour of Microlocal Analysis
A Walking Tour of Microlocal Analysis Jeff Schonert August 10, 2006 Abstract We summarize some of the basic principles of microlocal analysis and their applications. After reviewing distributions, we then
More informationDavid E. Barrett and Jeffrey Diller University of Michigan Indiana University
A NEW CONSTRUCTION OF RIEMANN SURFACES WITH CORONA David E. Barrett and Jeffrey Diller University of Michigan Indiana University 1. Introduction An open Riemann surface X is said to satisfy the corona
More informationStrong uniqueness for second order elliptic operators with Gevrey coefficients
Strong uniqueness for second order elliptic operators with Gevrey coefficients Ferruccio Colombini, Cataldo Grammatico, Daniel Tataru Abstract We consider here the problem of strong unique continuation
More informationCHARACTERIZATIONS OF PSEUDODIFFERENTIAL OPERATORS ON THE CIRCLE
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY Volume 125, Number 5, May 1997, Pages 1407 1412 S 0002-9939(97)04016-1 CHARACTERIZATIONS OF PSEUDODIFFERENTIAL OPERATORS ON THE CIRCLE SEVERINO T. MELO
More informationRemarks on Bronštein s root theorem
Remarks on Bronštein s root theorem Guy Métivier January 23, 2017 1 Introduction In [Br1], M.D.Bronštein proved that the roots of hyperbolic polynomials (1.1) p(t, τ) = τ m + m p k (t)τ m k. which depend
More informationAlgebras of singular integral operators with kernels controlled by multiple norms
Algebras of singular integral operators with kernels controlled by multiple norms Alexander Nagel Conference in Harmonic Analysis in Honor of Michael Christ This is a report on joint work with Fulvio Ricci,
More informationProceedings of the 5th International Conference on Inverse Problems in Engineering: Theory and Practice, Cambridge, UK, 11-15th July 2005
Proceedings of the 5th International Conference on Inverse Problems in Engineering: Theory and Practice, Cambridge, UK, 11-15th July 2005 SOME INVERSE SCATTERING PROBLEMS FOR TWO-DIMENSIONAL SCHRÖDINGER
More information引用北海学園大学学園論集 (171): 11-24
タイトル 著者 On Some Singular Integral Operato One to One Mappings on the Weight Hilbert Spaces YAMAMOTO, Takanori 引用北海学園大学学園論集 (171): 11-24 発行日 2017-03-25 On Some Singular Integral Operators Which are One
More information(1.2) Im(ap) does not change sign from to + along the oriented bicharacteristics of Re(ap)
THE RESOLUTION OF THE NIRENBERG-TREVES CONJECTURE NILS DENCKER 1. Introduction In this paper we shall study the question of local solvability of a classical pseudodifferential operator P Ψ m cl (M) on
More informationSobolev regularity for the Monge-Ampère equation, with application to the semigeostrophic equations
Sobolev regularity for the Monge-Ampère equation, with application to the semigeostrophic equations Alessio Figalli Abstract In this note we review some recent results on the Sobolev regularity of solutions
More informationREGULARITY RESULTS FOR THE EQUATION u 11 u 22 = Introduction
REGULARITY RESULTS FOR THE EQUATION u 11 u 22 = 1 CONNOR MOONEY AND OVIDIU SAVIN Abstract. We study the equation u 11 u 22 = 1 in R 2. Our results include an interior C 2 estimate, classical solvability
More informationViscosity Iterative Approximating the Common Fixed Points of Non-expansive Semigroups in Banach Spaces
Viscosity Iterative Approximating the Common Fixed Points of Non-expansive Semigroups in Banach Spaces YUAN-HENG WANG Zhejiang Normal University Department of Mathematics Yingbing Road 688, 321004 Jinhua
More informationAn Example on Sobolev Space Approximation. Anthony G. O Farrell. St. Patrick s College, Maynooth, Co. Kildare, Ireland
An Example on Sobolev Space Approximation Anthony G. O Farrell St. Patrick s College, Maynooth, Co. Kildare, Ireland Abstract. For each d 2 we construct a connected open set Ω d such that Ω =int(clos(ω))
More informationWAVE FRONTS OF ULTRADISTRIBUTIONS VIA FOURIER SERIES COEFFICIENTS
Matematiki Bilten ISSN 0351-336X Vol.39 (LXV) No.2 UDC: 517.443:517.988 2015 (5359) Skopje, Makedonija WAVE FRONTS OF ULTRADISTRIBUTIONS VIA FOURIER SERIES COEFFICIENTS DIJANA DOLI ANIN-DJEKI, SNJEZANA
More informationON THE BEHAVIOR OF THE SOLUTION OF THE WAVE EQUATION. 1. Introduction. = u. x 2 j
ON THE BEHAVIO OF THE SOLUTION OF THE WAVE EQUATION HENDA GUNAWAN AND WONO SETYA BUDHI Abstract. We shall here study some properties of the Laplace operator through its imaginary powers, and apply the
More informationBoundary Integral Equations on the Sphere with Radial Basis Functions: Error Analysis
Boundary Integral Equations on the Sphere with Radial Basis Functions: Error Analysis T. Tran Q. T. Le Gia I. H. Sloan E. P. Stephan Abstract Radial basis functions are used to define approximate solutions
More informationUniversität Regensburg Mathematik
Universität Regensburg Mathematik Harmonic spinors and local deformations of the metric Bernd Ammann, Mattias Dahl, and Emmanuel Humbert Preprint Nr. 03/2010 HARMONIC SPINORS AND LOCAL DEFORMATIONS OF
More informationASYMPTOTIC BEHAVIOR OF GENERALIZED EIGENFUNCTIONS IN N-BODY SCATTERING
ASYMPTOTIC BEHAVIOR OF GENERALIZED EIGENFUNCTIONS IN N-BODY SCATTERING ANDRAS VASY Abstract. In this paper an asymptotic expansion is proved for locally (at infinity) outgoing functions on asymptotically
More informationTobias Holck Colding: Publications. 1. T.H. Colding and W.P. Minicozzi II, Dynamics of closed singularities, preprint.
Tobias Holck Colding: Publications 1. T.H. Colding and W.P. Minicozzi II, Dynamics of closed singularities, preprint. 2. T.H. Colding and W.P. Minicozzi II, Analytical properties for degenerate equations,
More informationDIV-CURL TYPE THEOREMS ON LIPSCHITZ DOMAINS Zengjian Lou. 1. Introduction
Bull. Austral. Math. Soc. Vol. 72 (2005) [31 38] 42b30, 42b35 DIV-CURL TYPE THEOREMS ON LIPSCHITZ DOMAINS Zengjian Lou For Lipschitz domains of R n we prove div-curl type theorems, which are extensions
More informationOn stable inversion of the attenuated Radon transform with half data Jan Boman. We shall consider weighted Radon transforms of the form
On stable inversion of the attenuated Radon transform with half data Jan Boman We shall consider weighted Radon transforms of the form R ρ f(l) = f(x)ρ(x, L)ds, L where ρ is a given smooth, positive weight
More informationStationary isothermic surfaces and some characterizations of the hyperplane in the N-dimensional Euclidean space
arxiv:081.165v1 [math.ap] 11 Dec 008 Stationary isothermic surfaces and some characterizations of the hyperplane in the N-dimensional Euclidean space Rolando Magnanini and Shigeru Sakaguchi October 6,
More informationR. Courant and D. Hilbert METHODS OF MATHEMATICAL PHYSICS Volume II Partial Differential Equations by R. Courant
R. Courant and D. Hilbert METHODS OF MATHEMATICAL PHYSICS Volume II Partial Differential Equations by R. Courant CONTENTS I. Introductory Remarks S1. General Information about the Variety of Solutions.
More informationELLIPTIC RECONSTRUCTION AND A POSTERIORI ERROR ESTIMATES FOR PARABOLIC PROBLEMS
ELLIPTIC RECONSTRUCTION AND A POSTERIORI ERROR ESTIMATES FOR PARABOLIC PROBLEMS CHARALAMBOS MAKRIDAKIS AND RICARDO H. NOCHETTO Abstract. It is known that the energy technique for a posteriori error analysis
More informationSelf-dual Smooth Approximations of Convex Functions via the Proximal Average
Chapter Self-dual Smooth Approximations of Convex Functions via the Proximal Average Heinz H. Bauschke, Sarah M. Moffat, and Xianfu Wang Abstract The proximal average of two convex functions has proven
More informationLocal semiconvexity of Kantorovich potentials on non-compact manifolds
Local semiconvexity of Kantorovich potentials on non-compact manifolds Alessio Figalli, Nicola Gigli Abstract We prove that any Kantorovich potential for the cost function c = d / on a Riemannian manifold
More informationRADIATION FIELDS ON ASYMPTOTICALLY EUCLIDEAN MANIFOLDS
RADIATION FIELDS ON ASYMPTOTICALLY EUCLIDEAN MANIFOLDS ANTÔNIO SÁ BARRETO Abstract. F.G. Friedlander introduced the notion of radiation fields for asymptotically Euclidean manifolds. Here we answer some
More information